As recalled in Sect. 1, the cause of the wiggling structure observed in molecular outflows is not completely understood. Several models have been proposed to account for
the variability of the ejection direction: orbital motion of a binary system [1]}, jet precession due to tidal interactions between the associated protostellar disk and a non-coplanar binary companion [2]}, misalignment between the disk rotation axis and the ejection mechanism [3]}. The latter model requires only a single protostar.
